Sucker rod fishing tool



Oct. 30, 1951 T. M. HUNT SUCKER ROD FISHING TOOL Filed May 24, 1948 W W W N 4 K Y f 7 Patented Oct. 30, 1 951 UNITED. STATES "PATENT OFFICE SUCKER ROD FISHING TOOL Theodore M. Hunt, Tulsa, Okla.

1 Application May 24, 1948, Serial No. 28,865

" 1 Claim. (01. 294-102) This invention relates to a sucker rod fishin tool, and more particularly to an improved fishing tool of this kind for securely grasping broken sections of sucker rod within the well tubing.

An object of this invention is to provide an improved device for withdrawing or removing a broken section of a sucker rod from a well casing, which section of sucker rod is connected to the rod box.

An object of this invention is to provide an improved sucker rod fishing tool of this kind having a socket which is formed with a smooth inner surface throughout its length in order to utilize the full strength of the walls of the socket in gripping and supporting the broken ends.

Still another object of this invention is to provide a grapple or sucker rod fishing tool for securely engaging the lower end of a broken rod box in such a manner that the box may be readily withdrawn from the well.

To the foregoing objects, and others which may hereinafter more fully appear, the invention consists of the novel construction, combination and arrangement of parts, as will be more specifically referred to and illustrated in the accompanying drawings, but it is to be understood that changes, variations, and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawings:

Figure 1 is a vertical section through a sucker rod box engaging tool constructed according to an embodiment of my invention.

Figure 2 is a fragmentary vertical section showing the trap or plate in the raised position.

Figure 3 is a transverse section taken on the line 3-3 of Figure 1.

Figure 4 is a horizontal section taken on the line 4--4 of Figure 3.

In Figures 1 to 4, inclusive, there is shown an embodiment of my invention for drawing a broken section of a sucker rod R from a well casing which section of the sucker rod is connected to the rod box B. The sucker rod fishing tool for removing sections of rod having a box B mounted thereon is formed of an outer housing or body 40 having a socket member 4| fixed to the lower end thereof. The socket member 4| is formed with a reduced diameter threaded outer connecting surface at its upper end for engagement with the lower threaded end of the housing 4|]. The outer surface of the socket 4| below the connection to the housing 40 is substantially flush with the outer surface of the housing to provide for the free sliding movement of the tool in the well casing. The outer surface of the socket 4| below the housing 40 is formed with flats 42 for engagement of an attaching tool in securing the socket to the housing. The socket 4| is formed with a bore 44 extending throughout the length thereof which opens at both ends of the socket. The lower end of the bore, opening, or passage 44 is formed with downwardly and outwardly flared walls 45 to provide a conical surface for guiding the socket about the sucker rod and the rod box mounted thereon. The opening or bore 44 is sufficiently large to permit the free passage of the sucker rod box B upwardly through the socket member and into the housing or body 40. The upper end of the socket 4| is provided with an ogee surface or seat 46. A cover or bearing plate as 41 is pivotally mounted on the upper end of the socket 4| on one side thereof within the housing 40. The cover plate 41 is semi-cylindrical in transverse cross-section as clearly shown in Figure 3 of the drawings, the plate 41 being formed as a segment of a tubular pipe or the like. The side edges of the cover or bearing plate 41 are inclined arcuately and convergingly toward the ends of the plate to provide an ogee bearing surface for engagement with the upper edge or seat 46 of the socket member.

The plate 41 is provided with a hinge barrel 48 at one end thereof for engagement between the arms 49 which are fixed on the upper end of the socket 4|. A pin or pintle 50 extends through the arms 49 and the barrel 48 for pivotally mounting the cap 41 onto the upper end of the socket 4|. The plate 41 is also formed with an outwardly extending opening 5| which extends radially thereof being open at the center for engagement therein of the sucker rod to be removed from the well casing.

In the use and operation of the tool for removing the sucker rod having a rod box mounted thereon, the socket 4| is lowered into the well casing and the sucker rod box is guided into the housing 40 by the initial engagement of the upwardly converging walls 45 over the upper end of the box B. The box B will then slide upwardly in the socket and engage the lower surface of the plate 47. The further downward extension of the socket in the casing will cause the plate 41 to be rocked upwardly where the upper surface of the plate 41 will be in substantially flush engagement with the inner surface of the housing or body 40 above the socket 4|. In this position of the plate 41 the rod box B is free to be disposed within the housing 40 above the socket 4|. As the box B is extended upwardly into the housing beyond the plate 41, the weight of the plate interiorly of the pivot pin will cause the plate to drop to a horizontal position across the upper end of the socket. The sucker rod B may be engaged within the radial opening or cut-out 5| in the plate 47. Drawing the socket ll upwardly for removing the rod R and box B from the well casing, the box B will bear against the upper surface of the plate 4'! where it will be firmly secured within the housing 40. In this manner the sucker rod R having the box B connected thereto may be withdrawn from the well casing,

I claim:

A sucker rod box grapple comprising-a. cylindrical body having an unbroken wall of substantially uniform thickness, a tubular socket having an ogee upper end engaging within the-lower end of said body, said socket being formed with a central bore therethrough, a transversely arcuate bearing plate having a circular ogee rim, said rim corresponding in configuration to said o ee upper end and engageable about the entire periphery thereof and adapted to seat on said ogee 4 upper end of said socket, said plate being formed with a radial cut-out, and means comprising an apertured lug and a pivot pin pivotally mounting said plate on said socket, said socket having a pair of apertured upstanding lugs on the upper surface thereof, said pin passing through the aperture therein and the aperture in said first mentioned lug, said cut-out being adapted to receive the sucker rod whereby said plate will be pivoted upwardly by the rod box'when said socket is lowered thereover and will pivot downwardly when the rod box is disposed thereabove for proriding a seat for the rod box.

THEODORE M. HUNT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name 4 3- l,7'23, 962 Davis v Aug. 26 194340 2,Q &, 4l9 S annon -r- -n---. p 28, 9 7 

